ledscan.c

利用51单片机实现4*4的键盘扫描程序 在多个51平台中验证通过

#include "reg52.h"

unsigned char   code led[]={0x3f,0x06,0x5b,0x4f};
unsigned char  i=0; 
unsigned char  	 code1;
void initTimer(void)
{
 TMOD=0x01;
 TH1=0x15;
 TL1=0xa0;
}

void timer0(void) interrupt 3
{ 

 TH1=0xee;
 TL1=0x3c;
 i++;
 if(i>4)
 {i=0;
 code1=0xfe;}
 P2=led[i];
 P1=code1;
 code1=code1<<1|0x01;

}

void main(void)
{
initTimer();
EA=1;
ET1=1;
TR1=1;
code1=0xfe;
while(1);
}